Question Is it possible to couple registered ram with non-server CPU?

[Wing901]

x99 motherboards serve both Xeon and i7 5xxx, 6xxx CPUs, can I couple registered ram with a non-server CPU(such as i7 6xxx series) on this kind of motherboard?

 

[USAFRet]

x99 motherboards serve both Xeon and i7 5xxx, 6xxx CPUs, can I couple registered ram with a non-server CPU(such as i7 6xxx series) on this kind of motherboard?

What does the motherboard manual say for CPU compatibility?

 

[Wing901]

What does the motherboard manual say for CPU compatibility?

Xeon E5, i7 5xxxK, 6xxxK

 

[USAFRet]

Xeon E5, i7 5xxxK, 6xxxK

I'm thinking it goes into a little more detail than that.

 

[Wing901]

Core i7-5820K, 5930K, 5960X, 6800K, 6850K, 6900K, 6950X.

Intel Xeon E5-1603, E5-1620-v3, E5-1630-v3, E5-1650-v3, E5-1660-v3, E5-2603-v3, E5-2609-v3, E5-1607 V4, E5-1620-v4, E5-1630-v4, E5-1650 v4, E5-1660-v4, E5-1680-v4, E5-2603 v4, E5-2609 v4......up to E5-2699-v4.

 

[USAFRet]

Core i7-5820K, 5930K, 5960X, 6800K, 6850K, 6900K, 6950X.

Intel Xeon E5-1603, E5-1620-v3, E5-1630-v3, E5-1650-v3, E5-1660-v3, E5-2603-v3, E5-2609-v3, E5-1607 V4, E5-1620-v4, E5-1630-v4, E5-1650 v4, E5-1660-v4, E5-1680-v4, E5-2603 v4, E5-2609 v4......up to E5-2699-v4.

And you've not given us the specific motherboard, or link.

 

[Wing901]

And you've not given us the specific motherboard, or link.

ASRock > X99 Extreme3

ASRock Super Alloy, - XXL Aluminum Alloy Heatsink, - Premium 60A Power Choke, - Premium Memory Alloy Choke, - Ultra Dual-N MOSFET (UDM), - NexFET™ MOSFET, - Nichicon 12K Platinum Caps, - Sapphire Black PCB; Supports Intel Core™ i7 and Xeon 22-Core Processors Family for the LGA 2011-3 Socket...

www.asrock.com

 

[USAFRet]

ASRock > X99 Extreme3

ASRock Super Alloy, - XXL Aluminum Alloy Heatsink, - Premium 60A Power Choke, - Premium Memory Alloy Choke, - Ultra Dual-N MOSFET (UDM), - NexFET™ MOSFET, - Nichicon 12K Platinum Caps, - Sapphire Black PCB; Supports Intel Core™ i7 and Xeon 22-Core Processors Family for the LGA 2011-3 Socket...

www.asrock.com

Nothing in there says it won't work.
So maybe try it.

 

[Wing901]

Or can I couple unbuffered ram with a server type CPU?

 

[USAFRet]

Or can I couple unbuffered ram with a server type CPU?

So you don't have any of these parts yet?

 

[Misgar]

Or can I couple unbuffered ram with a server type CPU?

You can use un-buffered RAM on an E5 series CPU according to the mobo manual:
https://www.asrock.com/mb/intel/x99 extreme3/#Memory
"Note4: The DDR4 ECC, un-buffered memory/RDIMM is supported with Intel® Xeon® processors E5 series in the LGA 2011-3 Socket."

On my HP Xeon servers, UDIMM gives the lowest memory, RDIMM allows greater capacity and LRDIMM the highest capacity.

Provided you don't mix UDIMM with RDIMM, either should work if supported by the CPU and the mobo.

RDIMM is good if you need more memory capacity than UDIMM allows, but it might run slower than UDIMM, due to the registers.

ECC tends to run slower than non-ECC. How much RAM do you need?

I'd consider using memory on the motherboard manufacturer's Qualified Vendor List, or check if your motherboard is mentioned on the Crucial or Kingston web sites.

First thing I'd do is pick a CPU. Make sure it's compatible with the mobo, then check the CPU spec on the Intel web site and see what memory types it supports. Finally, buy the memory.

 

[Wing901]

You can use un-buffered RAM on an E5 series CPU according to the mobo manual:
https://www.asrock.com/mb/intel/x99 extreme3/#Memory
"Note4: The DDR4 ECC, un-buffered memory/RDIMM is supported with Intel® Xeon® processors E5 series in the LGA 2011-3 Socket."

On my HP Xeon servers, UDIMM gives the lowest memory, RDIMM allows greater capacity and LRDIMM the highest capacity.

Provided you don't mix UDIMM with RDIMM, either should work if supported by the CPU and the mobo.

RDIMM is good if you need more memory capacity than UDIMM allows, but it might run slower than UDIMM, due to the registers.

ECC tends to run slower than non-ECC. How much RAM do you need?

I'd consider using memory on the motherboard manufacturer's Qualified Vendor List, or check if your motherboard is mentioned on the Crucial or Kingston web sites.

First thing I'd do is pick a CPU. Make sure it's compatible with the mobo, then check the CPU spec on the Intel web site and see what memory types it supports. Finally, buy the memory.

Thanks

So you don't have any of these parts yet?

I have a Xeon CPU.

 

[Misgar]

Going back to your original question about Registered versus Un-buffered RAM, what exactly is your "use case"? How much RAM do your apps need now and potentially in the next two years?

Each memory type has its own afvantages and disadvantages:
https://hatchjs.com/registered-ecc-vs-unbuffered-ecc/

"Registered ECC memory can typically achieve higher data transfer rates than unbuffered ECC memory, but it is also more expensive. Unbuffered ECC memory is less expensive than registered ECC memory, but it can be less reliable in some cases."

If money is no object and your CPU supports it, buy Registered. If you're on a limited budget, buy Un-buffered if it's cheaper.

I'd go for 128GB un-buffered if 64GB registered was significantly more expensive. Either way, ECC should provide some protection from "bit flip".

It's far better to buy a single kit of matched DIMMs, as opposed to multiple pairs of unmatched DIMMs, e.g.

this 128GB kit (4x32GB):
https://www.amazon.com/NEMIX-RAM-4X32GB-3200MHZ-PC4-25600/dp/B0CS4WJMVF

Please note, I have no idea if this RAM is compatible with your Xeon or mobo. I am simply using it as an example of complete kits, not disparate pairs from batches manufactured on different days, with potentially different timings.

A single kit of four matched 32GB DIMMs is better than two unmatched pairs.

If your Xeon incorporates four IMC (Integrated Memory Controller) channels, fit DIMMs four at a time for greatest bandwidth.